Drainage pipe



Sept 17, 1963 L. E. MCDUFF ETAL DRAINAGE PIPE Filed June 1,- 1962 1-......" .1. A'AVAWA'AVA'A United States Patent O 3,103,739 DRAINAGE PIPE Leon E. McDui, Corona, and .lohn I. Elmore, r., Brava/ley, Calif., assignors to Lidco, Ine., Bravi/ley, Calif., a `corporation of California Ficd .lune 1., 1962, Ser. No. 199,470 6 Ciairns. (Cl. 6111) This invention relates to an improved drainage pipe.

It is frequently `desirable to provide means for draining oft excess water from the undersurface of, for example, an agricultural iield. In the past, lines of clay or concrete tile have been used for this purpose. However, such drains frequently fail due to plugging up or shifting of the earth during earthquakes, or for other reasons.

It is an object of this invention to provide a drainage pipe for subsurface drainage which is a continuous unit and thus eliminate many causes of failure of such pipe.

It is still a further object of this invention to provide a pipe having a dur-able filtering junction.

Still a further object of .the invention is to provide a pipe wherein the filter may be closely controlled and inspected.

Other objects and advantages will be readily apparent from the following description.

In the drawings:

FIGURE 1 is a side elevation with part thereof broken away of one form of the invention.`

FIGURE 2 is a perspective of one form of the pipe.

FIGURE 3 is -a view similar to FIGURE 2 of a modiiied form of pipe.

FIGURE 4 is a view similar to FIGURE 2 of a further modiiied form of this invention.

FIGURE 5 is an end view of a further modification of the invention.

A pipe is formed of a natural plastic such as coal-tar or of a foamed plastic such as urethene, epoxy, styrene, phenolic or the like, with a strip 12 of liber glass batting molded either longitudinally in the form of FIGURE 2 or spirally in the form of FIGURE 3 the length thereof.

During the forming process, the plastic will penetrate the edge of the strip 12 and hold same rmly in place with suflicient area of the iiber glass filtering strip untouched by the plastic to permit free flow of water therethrough into the pipe while preventing dirt and the like from entering same.

3,103,789 Patented Sept. 17, 1963 ICC The spiral form of strip provides iiexibility permitting bending or curving of the pipe. The filtering material may be in the form of patches 14 as seen in FIGURE 4 instead of a strip and likewise may be of rock wool or open cell foamed plastic or other suitable filtering media preferably inert.

T he pipe may be strengthened by inserting a suitable iiller such as gravel 16 or other suitable material in the ioarned plastic as seen in FIGURE 5 or -by a spirally wound strip 18 of suitable material.

While what hereinbefore has been described as the preferred embodiment of this invention, it is readily apparent that modifications and alterations can be made without departing from the scope of the invention.

We claim:

1. A subsurface drainage pipe comprising: a plastic pipe having `at least one void therein lled with a suitable iltering material bonded to the pipe.

t2. A subsurface drainage pipe comprising: a foamed plastic pipe having at least one void therein iilled with a suitable iiltering material and bonded to the pipe.

:3. A subsurface drainage pipe comprising: a foamed plastic pipe having at least one void therein, filled with a fiberglass molded to said pipe.

4. A subsurface drainage pipe comprising: a foamed plastic pipe having at least one void therein filled with a suitable iiltering material and bonded to the pipe, said void constituting a longitudinal strip.

5. A subsurface drainage pipe comprising: a foamed plastic pipe having at least one void therein filled with a suitable filtering material and bonded lto the pipe, said void constituting a spiral strip.

6. A subsurface drainage pipe comprising: a foarned plastic pipe having at least one Void therein, a iiberglass matting illing said void with said plastic permeating a portion only of said matting.

References Cited in the iile of this patent UNITED STATES PATENTS Re. 16,994 Cohn lune l2, 1928 679,131 IThompson July 23, 1901 1,894,295 Scandore Ian. 17, 1933 2,879,803 Francois Mar. 31, 1959 2,966,690 Rochlin Ian. 3, 1961 

6. A SUBSURFACE DRAINAGE PIPE COMPRISING: A FOAMED PLASTIC PIPE HAVING AT LEAST ONE VOID THEREIN; A FIBERGLASS MATTING FILLING SAID VOID WITH SAID PLASTIC PERMEATING A PORTION ONLY OF SAID MATTING. 